I always found sharpening round woodturning gouges (assuming that’s what you are referring to) on a flat stone by hand to be a bit beyond my ability.
If you want an affordable(ish) option I’d recommend a grinder and if you look up “sharpening woodturning gouges by hand” on YouTube you’ll see lots of examples on how you can do it with a couple of different grit wheels and the tool rest.
If you don’t fancy doing it by hand you could get one of the attachment jigs, such as wolverine (there are cheaper equivalents), that allow you to shape the various grinds.
Personally I went for the Sorby pro edge, but it ain’t cheap…
Cheers
Ash